8/14/2023 0 Comments Nasodigital hyperkeratosis dog paw![]() ![]() A fungal culture may also be indicated, as some fungal diseases share clinical features with MCP. Treatment of MCP involves topical therapies and systemic antibiotics. If cytology does not reveal bacteria, a bacterial culture is sterile, and there is a failed response to antimicrobial therapy, submission of a tissue biopsy for dermatohistopathology is indicated, as Discoid lupus erythematosus is a condition with similar clinical appearance. Bacterial culture and susceptibility testing of revealed purulent exudate from under a protected crust is indicated if there is a failed response to appropriate antibiotic therapy. Cytology of exudate reveals bacteria and inflammatory cells. Diagnosis is made via dermatologic examination, cytology and response to treatment. ![]() A thick purulent exudate is revealed beneath elevated crusts and one can observe the erosive to ulcerative dermatitis. Crusts then fissures and erosions develop. If the nasal planum is affected, there is an initial erythema and swelling of nasal planum, typically at the alar folds. MCP affects the mucocutaneous junctions of the nasal planum and lips primarily, but other mucocutaneous junction sites are usually concurrently affected. German shepherd dogs are the most commonly affected breed. MCP is a bacterial infection usually caused by Staphylococcus pseudintermedius. Mucocutaneous pyoderma (MCP) is a common condition that may affect the nasal planum. Types of Infectious Skin Diseases Mucocutaneous Pyoderma (MCP) If erosions, crusts, and ulcers are noted, we consider infectious, immune mediated, autoimmune, or neoplastic conditions. If depigmentation is noted, we differentiate between inflammatory conditions like discoid lupus erythematosus where there is a loss of cobblestone architecture and non-inflammatory conditions like vitiligo where the cobblestone architecture is maintained. If scale is seen, we consider metabolic conditions like zinc responsive dermatosis, congenital conditions like inherited nasal hyperkeratosis, or early presentations of immune mediated conditions like those in the pemphigus complex. Many lesion types occur on the nasal planum. Diseases that affect this anatomic site may be congenital, environmental, infectious, metabolic, immune-mediated, autoimmune, or neoplastic in origin. The nasal planum has a distinct cobblestone architecture, pigmentation, and a modified thick epidermis characterized by rete pegs and absence of hair follicles. The aim is to familiarize one with the clinical appearance of nasal planum diseases, so one can formulate a differential list, work through a diagnostic plan, and prescribe a treatment plan. An overview of salient features of the more common skin diseases affecting the nasal planum of dogs is presented. A few of these only affect the nasal planum. Several skin diseases may affect the nasal planum, or external nose, of dogs.
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